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OCT to DEC Converter Online

Converting octal numbers to decimal helps understand the numeric values of Unix file permissions and other octal representations.

number-base
OCT → DEC
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10

Decimal (DEC)

Convert from/to decimal number system

01

Binary (BIN)

Convert from/to binary number system

0x

Hexadecimal (HEX)

Convert from/to hexadecimal number system

0o

Octal (OCT)

Convert from/to octal number system

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Frequently Asked Questions

Each digit of the octal number is multiplied by the corresponding power of 8. For example, 377₈ = 3×64 + 7×8 + 7×1 = 255₁₀.
In chmod, each digit is the sum of permissions: read (4) + write (2) + execute (1). For example, 755₈ = owner rwx (7), group r-x (5), others r-x (5), which equals 493 in decimal.
In most programming languages, octal numbers use the prefix 0o (Python, JavaScript) or 0 (C, Java). For example, 0o377 = 255 in decimal.